Assessment Rationale:

Lepthyphantes impudicus is endemic to Madeira Island, Portugal. This species has a restricted geographic range with a maximum estimate of extent of occurrence (EOO) and area of occupancy (AOO) of ca 700 km². However, Lepthyphantes impudicus is assessed as Least Concern (LC), since the preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area or quality and the population is therefore assumed to be stable. A monitoring of population trends should be conducted to confirm species status.

Geographic Range:

Lepthyphantes impudicus is known throughout the laurisilva forest that occupies about 20% of the island of Madeira (Portugal), mainly on its steep and humid northern slopes. Multiple collection sites are recorded for the species, mostly recent (Kulczyński 1909, Denis 1962, Crespo et al. 2014). It was possible to perform species distribution modelling to predict its potential range with confidence limits (Cardoso et al. 2017). The extent of occurrence (EOO) is estimated to be between 153-736 km² and the area of occupancy (AOO) to be between 152-736 km².

Regions:
Portugal - Madeira

Extent of Occurrence (EOO):
153-736,400 (km2)

Area of Occupancy (AOO):
152-736,400 (km2)

Elevation Lower Limit:
200 (m)

Elevation Upper Limit:
1850 (m)

Biogeographic Realms:
Palearctic

Presence:
Extant

Origin:
Endemic Madeira

Seasonality:
Resident

Population:

No population size estimates exist, but the population is assumed to be stable, since the preferred habitat of the species is not experiencing a decline in area and the invasive species present seem not to affect the spider population.

Habitat and Ecology

Leptyphantes impudicus is restricted to the humid laurisilva forest on the northern slopes of Madeira Island. This species is a sheet-web builder on the tree branches feeding mainly on small insects.

Major Threat(s):

There are no known threats to this species.

Conservation Actions

No specific conservation measures are in place for this species, but most of the species range is inside the Madeira Natural Park. Monitoring of population trends should be conducted to confirm species status.